Engineering guidelines for mounting solar PV arrays on sandwich panels, examining additional dead loads (15-20 kg/m²), 5-rib geometry, clamp systems, and purlin checks.
Rooftop solar PV arrays transform industrial roofs into clean power generators, but adding 15-20 kg/m² of static load alongside severe wind uplift forces tests the envelope.
1. 5-Rib Geometry vs 3-Rib Distribution
5-rib panels feature 250 mm rib centers (vs 500 mm on 3-rib panels), doubling mechanical fastening points and transferring solar dead/wind loads directly into structural purlins.
Comprehensive Engineering Comparison Matrix
| Parameter | Standard Roof | Solar-Ready Roof Specification |
|---|---|---|
| Profile Geometry | 3 or 5 ribs | Mandatory 5-Rib Trapezoidal Panel |
| External Steel Skin | 0.40 mm to 0.50 mm | Minimum 0.50 mm (0.60 mm recommended) |
| Superimposed Load | 0 kg/m² | +15 to +20 kg/m² dead load |
| Purlin Spacing | 2.00 to 2.50 m | Max 1.80 to 2.00 m |
Specify 5-rib panels with at least 0.50 mm outer skin and PIR/Rockwool insulation for all rooftop solar PV projects.
Calculate Live with Your Project Dimensions
Apply the engineering criteria from this guide to your specific building; estimate take-offs, load capacities, and logistics instantly.
Galvanized C / Z / Sigma Purlin Span & Deflection Calculator
Specify your purlin span between trusses, purlin spacing and profile section to calculate deflection limits (L/200, L/300), safe capacity, and required steel tonnage per EN 1993-1-3.
Z200 / 2.00 mm (L = 6.00 m)
Frequently Asked Questions
Can panels be mounted without drilling through the roof? ▼
Yes, specialized aluminum clamps fix directly to the upper trapezoidal crowns without penetrating the base drainage trough.